Lost in the Grand Canyon -- The AMERICAN EXPERIENCE film website includes information about John Wesley Powell, the Bureau of Ethnology and the 1879 United States Geological Survey.http://www.pbs.org/wgbh/amex/canyon

The Paleontological Society -- an international nonprofit organization devoted exclusively to the advancement of the science of paleontology through the dissemination of research by publication and meetings.http://www.paleosoc.org/